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226 daniel-mar 1 
<?php
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# TODO: das kann ohne suffix auskommen: http://dx.doi.org/10.1038/
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# if (!interface_exists('VolcanoSearchProvider')) throw new Exception('Required interface "VolcanoSearchProvider" not found.');
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# if (!class_exists('VolcanoDB')) throw new Exception('Required class "VolcanoDB" not found.');
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require_once __DIR__ . '/../../core/VolcanoSearchProvider.class.php';
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class VolcanoSearchDOI implements VolcanoSearchProvider {
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        public static function checkId($id) {
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                return self::strEqual($id, 'doi', true); // is always case insensitive
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        }
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        public static function calcDistance($candidate, $searchterm) {
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                $y = explode('/', $searchterm);
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                $x = explode('/', $candidate);
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                $dist = count($y)-count($x);
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                for ($i=0; $i<min(count($x),count($y)); $i++) {
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                        if ($x[$i] != $y[$i]) return false;
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                }
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                return $dist;
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        }
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        protected static function strEqual($str1, $str2, $caseInsensitive = false) {
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                if ($caseInsensitive) {
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                        return strtolower($str1) == strtolower($str2);
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                } else {
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                        return $str1 == $str2;
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                }
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        }
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}
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require_once __DIR__ . '/../../core/1_VolcanoDB.class.php';
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VolcanoDB::registerSearchProvider(new VolcanoSearchDOI());
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# --- TEST
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$x = new VolcanoSearchDOI();
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assert($x->calcDistance('10.1000',  '10.1000/1') ==  1);
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assert($x->calcDistance('10.1000/1',  '10.1000') ==  -1);
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assert($x->calcDistance('10.1000',  '10.1000') ==  0);
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assert($x->calcDistance('10.1001',  '10.1000') ===  false);
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assert($x->calcDistance('10.1000/1/2/3',  '10.1000/1/2/3/4/5') ==  2);
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assert($x->calcDistance('10.1000/1/2/3',  '10.1000/1/2/3') ==  0);
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assert($x->calcDistance('10.1000/1/2/3/4/5',  '10.1000/1/2/3') ==  -2);
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assert($x->calcDistance('10.1000/1/2/x',  '10.1000/1/2/3/4/5') ===  false);
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assert($x->calcDistance('10.1000/1/2/x',  '10.1000/1/2/3') ===  false);
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assert($x->calcDistance('10.1000/1/2/x/4/5',  '10.1000/1/2/3') ===  false);